adjacent angles

 
        adjacent angles: Two angles that lie in the same plane, have a common vertex and a common side, but no common interior points.

    apothem: A segment that is drawn from the center of a regular polygon perpendicular to a side of the polygon

arc

    arc: A part of a circle that is defined by two endpoints.

circumscribed

    circumscribed: A circle is circumscribed about a polygon if the circle contains all the vertices of the polygon

     -A shape within a circle w/ the vertices located on the circle.

  complementary angles

    complementary angles: Two angles with             measures that have a sum of 90 degrees.